TWM567319U - transmission shaft - Google Patents

Abstract

A drive shaft includes a first shaft and a second shaft. The first rotating shaft has a first connecting end; and the second rotating end has a second connecting end, wherein the first connecting end is configured to drive the second connecting end to rotate the second rotating shaft when the first rotating shaft rotates.

Description

transmission shaft

A drive shaft, and more particularly, a drive shaft for a hand tool.

Generally, the hand tool is composed of components such as a motor, a transmission mechanism, a tool member, and a casing, wherein the transmission mechanism includes a gear set or a worm gear and a transmission shaft, etc., to cooperate with the motor to drive the tool member.

In the prior art, a hand tool such as a sanding machine presses the tool member against the workpiece during use, and the pressure generated at this time is applied to the gear set or the worm gear through the transmission shaft, thereby increasing the friction between the components, and This hinders the operation of the motor and the transmission mechanism, making the efficiency of the hand tool lower. In addition, since the position of both ends of the transmission shaft is fixed when the hand tool is assembled, if the fixed positions of the both ends are in error, the integrally formed transmission shaft in the prior art cannot be smoothly rotated. Therefore, how to provide a transmission shaft that can prevent the pressure from interfering with the operation of the motor and the transmission mechanism and allow a large error in assembly becomes an urgent problem to be solved in the industry.

In order to solve the problems of the prior art described above, it is an object of the present invention to provide a transmission shaft that can prevent the pressure from interfering with the operation of the motor and the transmission mechanism and can tolerate a large error in assembly.

In order to achieve the foregoing object, the transmission shaft of the present invention includes a first rotating shaft and a second rotating shaft.

The first rotating shaft has a first connecting end; and the second rotating end has a second connecting end, wherein the first connecting end is configured to drive the second connecting end to rotate the second rotating shaft when the first rotating shaft rotates.

In an embodiment, the first axis of rotation and the second axis of rotation are not in direct contact with a plane perpendicular to the axis.

In one embodiment, one of the first connection end and the second connection end is a convex structure, and the other is a concave structure corresponding in shape.

In an embodiment, the transmission shaft further includes a planetary carrier disposed on the first rotating shaft.

In an embodiment, the drive shaft further includes a first housing for abutting the planet carrier.

In an embodiment, the drive shaft further includes a worm gear or a gear coupled to the first rotating shaft.

In an embodiment, the drive shaft further includes a planet gear coupled to the worm gear or gear.

In an embodiment, the drive shaft further includes a bearing coupled to the second shaft.

In an embodiment, the drive shaft further includes a second housing coupled to the bearing.

In an embodiment, the drive shaft further includes a third housing coupled to the other end of the first rotating end opposite the first connecting end.

In an embodiment, the second rotating shaft further includes a slot disposed at the other end of the second connecting end.

The transmission shaft of the present invention includes a first rotating shaft and a second rotating shaft, wherein the first connecting end of the first rotating shaft drives the second rotating shaft when the first rotating shaft rotates, compared with the transmission shaft integrally formed in the prior art. The second connecting end rotates the second rotating shaft, so the transmission shaft of the present invention can accommodate a large error in assembly (compared to the integrally formed transmission shaft). Moreover, since the first rotating shaft and the second rotating shaft are not in direct contact with the plane perpendicular to the axial center, the pressure applied to the second rotating shaft is not directly applied to the first rotating shaft connected to the power source, so the transmission shaft is not affected or The operation of the power source. In addition, it is also possible to add a first housing or a third housing to maintain the position of the first rotating shaft, or to add a bearing and a second housing to maintain the position of the second rotating shaft, so as to avoid the effect of pressure influence. further.

The embodiments of the present invention are described below by way of specific embodiments, and those skilled in the art can readily appreciate the other advantages and advantages of the present invention as disclosed in the present disclosure. The present invention can also be implemented or applied in various other specific embodiments. The details of the present invention can be variously modified and changed without departing from the spirit and scope of the invention.

Please refer to FIG. 1 , which is a schematic structural view of a transmission shaft according to a first embodiment of the present invention. As shown, the transmission shaft of the present invention includes a first rotating shaft 1 and a second rotating shaft 2. The transmission shaft of the present invention is mainly used in the field of hand tools.

In one embodiment, the first shaft 1 has a first connection end 10 and is indirectly coupled to a power source (eg, a motor) through other transmission elements. The second shaft 2 has a second connecting end 20 and is connected directly or indirectly to a tooling member (for example a grinding disc or a drill bit or the like).

When the first rotating shaft 1 rotates, the first connecting end 10 drives the second connecting end 20 to rotate the second rotating shaft 2. To achieve this, the shapes of the first connecting end 10 and the second connecting end 20 must correspond to each other. For example, the first connecting end 10 can be a concave structure, and the second connecting end 20 can be a convex structure of opposite shape. , but not limited to this.

In general, the position of both ends of the transmission shaft is fixed during assembly. If there is an error in the fixed position of the two ends, the axis of the shaft is deviated, and the integrally formed transmission shaft cannot be smoothly rotated in the prior art. The two ends of the transmission shaft of the present invention are the first rotating shaft 1 and the second rotating shaft 2 respectively. Even if there is an error in the fixed positions of the two ends, the first rotating shaft 1 and the second rotating shaft 2 can still rotate respectively, as long as the first connecting end 10 can drive the first The two connecting ends 20 can be used. In other words, the transmission shaft of the present invention can accommodate a large error in assembly.

In an embodiment, the axes of the first rotating shaft 1 and the second rotating shaft 2 are on the same axis O, wherein the planes A1 and A2 of the first rotating shaft 1 perpendicular to the axis O and the second rotating shaft 2 and the shaft center The vertical planes A3 and A4 of O are not in direct contact. As shown in FIG. 1, the first rotating shaft 1 and the second rotating shaft 2 have gaps between the planes A1 and A3 and between the planes A2 and A4, and are not in direct contact. The first rotating shaft 1 and the second rotating shaft 2 are only between the shafts. The planes that are substantially parallel to the direction of the heart O will contact each other. When the hand tool is used, the second shaft 2 of the drive shaft is subjected to the pressure in the direction of the axis O, however, since the first shaft 1 and the second shaft 2 are on the planes A1, A2, A3, A4 perpendicular to the axis O, Since it is not in direct contact, the first rotating shaft 1 is not subjected to the pressure in the direction of the axis O, and the pressure in the direction of the axis O can be prevented from increasing the friction between the elements and hindering the operation of the drive shaft or the power source.

Please refer to FIG. 2 , which is a perspective view of the first connecting end and the second connecting end of the second embodiment of the present invention. In an embodiment, the first connecting end 10 can be a convex structure, and the second connecting end 20 is a concave structure corresponding to the shape, but not limited thereto. In other embodiments, the first connecting end 10 can be The concave structure and the second connecting end 20 are convex structures corresponding to the shape.

Please refer to FIG. 3 , which is a schematic structural view of a transmission shaft according to a third embodiment of the present invention. In an embodiment, the transmission shaft further includes a planetary carrier 3 disposed on the first rotating shaft 1. For example, the planetary carrier 3 may be in the shape of a disk, sleeved on the first rotating shaft 1 or integrally formed with the first rotating shaft 1 .

In an embodiment, the drive shaft further includes a first housing 4 for abutting the planet carrier 3 . For example, the first housing 4 can be part of a hand tool housing that can be used to maintain the position of the first shaft 1 to avoid pressure effects in the direction of the axis O.

In an embodiment, the drive shaft further includes a bearing 5 coupled to the second rotating shaft 2.

In an embodiment, the drive shaft further includes a second housing 6 coupled to the bearing 5. For example, the second housing 6 can be part of a hand tool housing, and the bearing 5 and the second housing 6 can be used to maintain the position of the second shaft 2 to prevent pressure in the direction of the axis O from affecting the first shaft 1.

In one embodiment, the drive shaft further includes a third housing 9 coupled to the other end of the first rotating shaft 1 opposite the first connecting end 10. For example, the third housing 9 can be part of a hand tool housing that can be used to maintain the position of the first shaft 1.

Further, when the hand tool is operated, the pressure in the direction of the axis O is generated, but the position of the first rotating shaft 1 can be fixed through the first housing 4 and the third housing 9, and the bearing 5 and the second housing 6 are fixed. Positioning the two shafts 2 such that the relative positions of the first shaft 1 and the second shaft 2 in the direction of the axis O are kept fixed to prevent the first shaft 1 and the second shaft 2 from directly contacting each other on a plane perpendicular to the axis O Therefore, the pressure in the direction of the axis O is applied only to the second rotating shaft 2 and is not applied to the first rotating shaft 1, so that the operation of the drive shaft or the power source is not hindered.

Please refer to FIG. 4 , which is a schematic structural diagram of a first rotating shaft according to a fourth embodiment of the present invention. In an embodiment, the transmission shaft further includes a worm wheel 7 or a gear (not shown) connected to the first rotating shaft 1. The worm gear 7 or gear can be used to connect with other transmission elements, such as a worm or other gear, and interlock with the power source to drive the first shaft 1 to rotate.

In an embodiment, the transmission shaft further includes a planetary gear 8 connected to the worm wheel 7 or the gear and mounted on the planetary carrier 3 .

As shown in FIG. 3, in an embodiment, the second rotating shaft further includes a slot 21 disposed at the other end of the second connecting end 20. The slot 21 can be used to attach a tool (such as a grinding disc or drill bit, etc.) and can have internal threads or fasteners or the like for securing the tool.

In summary, the transmission shaft of the present invention includes a first rotating shaft and a second rotating shaft, wherein the first connecting end of the first rotating shaft is configured to drive the second connecting end of the second rotating shaft to rotate when the first rotating shaft rotates The two shafts rotate, so the transmission shaft of the present invention can accommodate a large error in assembly (compared to the integrally formed transmission shaft). Moreover, since the first rotating shaft and the second rotating shaft are not in direct contact with the plane perpendicular to the axial center, the pressure applied to the second rotating shaft is not directly applied to the first rotating shaft connected to the power source, so the transmission shaft is not affected or The operation of the power source. In addition, it is also possible to add a first housing or a third housing to maintain the position of the first rotating shaft, or to add a bearing and a second housing to maintain the position of the second rotating shaft, so as to avoid the effect of pressure influence. further.

The above embodiments are merely illustrative of the principles of the present invention and its effects, and are not intended to limit the present invention. Modifications and variations of the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the patent application described later.

1‧‧‧First shaft
10‧‧‧First connection
2‧‧‧second shaft
20‧‧‧second connection
21‧‧‧ slots
3‧‧‧Planetary carrier
4‧‧‧First housing
5‧‧‧ bearing
6‧‧‧Second housing
7‧‧‧ worm gear
8‧‧‧ planetary gear
9‧‧‧ third housing
A1~A4‧‧‧ plane perpendicular to the axis
O‧‧‧Axis

1 is a schematic structural view of a transmission shaft according to a first embodiment of the present invention.

2 is a perspective view of the first connecting end and the second connecting end of the second embodiment of the present invention.

3 is a schematic view showing the structure of a transmission shaft according to a third embodiment of the present invention.

4 is a schematic structural view of a first rotating shaft of a fourth embodiment of the present invention.

Claims (11)

A transmission shaft includes: a first rotating shaft having a first connecting end; and a second rotating shaft having a second connecting end, wherein the first connecting end is configured to drive the second connecting end when the first rotating shaft rotates To rotate the second shaft. The transmission shaft according to claim 1, wherein the first rotating shaft and the second rotating shaft are not in direct contact with each other on a plane perpendicular to the axial center. The transmission shaft of claim 1, wherein one of the first connection end and the second connection end is a convex structure, and the other is a concave structure corresponding in shape. The transmission shaft of claim 1, wherein the transmission shaft further comprises a planetary carrier disposed on the first rotating shaft. The drive shaft of claim 4, wherein the drive shaft further includes a first housing for abutting the planet carrier. The transmission shaft of claim 4, wherein the transmission shaft further comprises a worm gear or a gear coupled to the first shaft. The transmission shaft of claim 6, wherein the transmission shaft further comprises a planetary gear coupled to the worm gear or gear. The drive shaft of claim 1, wherein the drive shaft further includes a bearing coupled to the second shaft. The drive shaft of claim 8, wherein the drive shaft further includes a second housing coupled to the bearing. The transmission shaft according to claim 1, wherein the transmission shaft further includes a third housing connected to the other end of the first rotation end opposite to the first connection end. The transmission shaft of claim 1, wherein the second shaft further comprises a slot disposed at the other end opposite to the second connection end.